Environmental Engineering Reference
In-Depth Information
The resulting has a higher value than that given by (5.21), and is
inversely dependent on the geometric media of
and
5.3.3 Current Buffer
Consider now the ideal compensation branch using the current buffer
depicted in Fig. 5.6. This solution is very efficient both for the gain-
bandwidth [C93], [RK95] and PSRR performance [A83], [RC84], [SS90],
[SGG91]. Moreover, it does not have the drawback exhibited by the voltage
buffer of reducing the amplifier output swing.
With an ideal current buffer, the second pole is given by
and the phase margin is by
By solving for the compensation capacitance we found
